package com.core.widget.staggeredgrid;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.view.animation.DecelerateInterpolator;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ListAdapter;
import android.widget.RelativeLayout;
import android.widget.Scroller;
import android.widget.TextView;

import com.core.R;
import com.core.util.NiceLogUtil;
import com.core.widget.xlistview.XListViewFooter;
import com.core.widget.xlistview.XListViewHeader;


public class XStaggeredGridView extends StaggeredGridView implements
		OnScrollListener {

	private float mLastY = -1; // save event y
	private Scroller mScroller; // used for scroll back
	private OnScrollListener mScrollListener; // user's scroll listener

	// the interface to trigger refresh and load more.
	private IXListViewListener mListViewListener;

	// -- header view
	private XListViewHeader mHeaderView;
	// header view content, use it to calculate the Header's height. And hide it
	// when disable pull refresh.
	private RelativeLayout mHeaderViewContent;
	private TextView mHeaderTimeView;
	private int mHeaderViewHeight; // header view's height
	private boolean mEnablePullRefresh = true;
	private boolean mPullRefreshing = false; // is refreashing.
	private boolean mHasMoreData = false;

	// -- footer view
	private XListViewFooter mFooterView;
	private boolean mEnablePullLoad;
	private boolean mPullLoading;
	private boolean mIsFooterReady = false;

	// total list items, used to detect is at the bottom of listview.
	private int mTotalItemCount;

	// for mScroller, scroll back from header or footer.
	private int mScrollBack;
	private final static int SCROLLBACK_HEADER = 0;
	private final static int SCROLLBACK_FOOTER = 1;

	private final static int SCROLL_DURATION = 400; // scroll back duration
	private final static int PULL_LOAD_MORE_DELTA = 50; // when pull up >= 50px
														// at bottom, trigger
														// load more.
	private final static float OFFSET_RADIO = 1.8f; // support iOS like pull
													// feature.

	/**
	 * @param context
	 */
	public XStaggeredGridView(Context context) {
		super(context);
		initWithContext(context);
	}

	public XStaggeredGridView(Context context, AttributeSet attrs) {
		super(context, attrs);
		initWithContext(context);
	}

	public XStaggeredGridView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		initWithContext(context);
	}

	private void initWithContext(Context context) {
		mScroller = new Scroller(context, new DecelerateInterpolator());
		// XListView need the scroll event, and it will dispatch the event to
		// user's listener (as a proxy).
		super.setOnScrollListener(this);

		// init header view
		mHeaderView = new XListViewHeader(context);
		mHeaderViewContent = (RelativeLayout) mHeaderView
				.findViewById(R.id.xlistview_header_content);
		mHeaderTimeView = (TextView) mHeaderView
				.findViewById(R.id.xlistview_header_time);
		addHeaderView(mHeaderView);

		// init footer view
		mFooterView = new XListViewFooter(context);
		addFooterView(mFooterView);
		mFooterView.hide();

		// init header height
		mHeaderView.getViewTreeObserver().addOnGlobalLayoutListener(
				new OnGlobalLayoutListener() {
					@Override
					public void onGlobalLayout() {
						mHeaderViewHeight = mHeaderViewContent.getHeight();
						getViewTreeObserver()
								.removeGlobalOnLayoutListener(this);
					}
				});

	}

	private OnScrollHorizental horizentalHandler = null;

	public OnScrollHorizental getHorizentalHandler() {
		return horizentalHandler;
	}

	public void setHorizentalHandler(OnScrollHorizental horizentalHandler) {
		this.horizentalHandler = horizentalHandler;
	}

	public interface OnScrollHorizental {
		void onScrollChanged(int x, int y, int oldx, int oldy);

		/**
		 * 向上滚动
		 */
		void OnUpScroll();

		/**
		 * 向下滚动
		 */
		void OnDownScroll();
	}

	@Override
	protected void onScrollChanged(int x, int y, int oldx, int oldy) {
		NiceLogUtil.D("GridView   oldY=" + oldy + "   currentY=" + y);
		// TODO Auto-generated method stub
		if (horizentalHandler != null) {
			NiceLogUtil.D("GridView   oldY=" + oldy + "   currentY=" + y);
			horizentalHandler.onScrollChanged(x, y, oldx, oldy);
			if (y - oldy > 20) {
				horizentalHandler.OnDownScroll();
			} else if (y - oldy < -20) {
				horizentalHandler.OnUpScroll();
			}

		}
		super.onScrollChanged(x, y, oldx, oldy);
	}

	@Override
	public void setAdapter(ListAdapter adapter) {
		// make sure XListViewFooter is the last footer view, and only add once.
		super.setAdapter(adapter);

	}

	/**
	 * enable or disable pull down refresh feature.
	 * 
	 * @param enable
	 */
	public void setPullRefreshEnable(boolean enable) {
		mEnablePullRefresh = enable;
		if (!mEnablePullRefresh) { // disable, hide the content
			mHeaderViewContent.setVisibility(View.INVISIBLE);
		} else {
			mHeaderViewContent.setVisibility(View.VISIBLE);
		}
	}

	/**
	 * enable or disable pull up load more feature.
	 * 
	 * @param enable
	 */
	public void setPullLoadEnable(boolean enable) {
		mEnablePullLoad = enable;
		if (!mEnablePullLoad) {
			// mFooterView.hide();
			mFooterView.setOnClickListener(null);
		} else {
			mPullLoading = false;
			// mFooterView.show();
			// mFooterView.setState(XListViewFooter.STATE_NORMAL);
			// both "pull up" and "click" will invoke load more.
			mFooterView.setOnClickListener(new OnClickListener() {
				@Override
				public void onClick(View v) {
					startLoadMore();
				}
			});
		}
	}

	public void setHasMoreData(boolean hasMoreDta) {
		mHasMoreData = hasMoreDta;

		if (mHasMoreData==true)
		{
			mFooterView.setVisibility(View.VISIBLE);
		}
		else
		{
			mFooterView.setVisibility(View.GONE);
		}


	}

	/**
	 * stop refresh, reset header view.
	 */
	public void stopRefresh() {
		if (mPullRefreshing == true) {
			mPullRefreshing = false;
			resetHeaderHeight();
		}
	}

	/**
	 * stop load more, reset footer view.
	 */
	public void stopLoadMore() {
		if (mPullLoading == true) {
			mPullLoading = false;
			mFooterView.setState(XListViewFooter.STATE_NORMAL);
		}
		if (!mHasMoreData) {
			mPullLoading = false;
			mFooterView.setState(XListViewFooter.STATE_FINISH);
		}
	}

	/**
	 * set last refresh time
	 * 
	 * @param time
	 */
	public void setRefreshTime(String time) {
		mHeaderTimeView.setText(time);
	}

	private void invokeOnScrolling() {
		if (mScrollListener instanceof OnXScrollListener) {
			OnXScrollListener l = (OnXScrollListener) mScrollListener;
			l.onXScrolling(this);
		}
	}

	private void updateHeaderHeight(float delta) {
		mHeaderView.setVisiableHeight((int) delta
				+ mHeaderView.getVisiableHeight());
		if (mEnablePullRefresh && !mPullRefreshing) { // 未处于刷新状态，更新箭头
			if (mHeaderView.getVisiableHeight() > mHeaderViewHeight) {
				mHeaderView.setState(XListViewHeader.STATE_READY);
			} else {
				mHeaderView.setState(XListViewHeader.STATE_NORMAL);
			}
		}
		// setSelection(0); // scroll to top each time
	}

	/**
	 * reset header view's height.
	 */
	private void resetHeaderHeight() {
		int height = mHeaderView.getVisiableHeight();
		if (height == 0) // not visible.
			return;
		// refreshing and header isn't shown fully. do nothing.
		if (mPullRefreshing && height <= mHeaderViewHeight) {
			return;
		}
		int finalHeight = 0; // default: scroll back to dismiss header.
		// is refreshing, just scroll back to show all the header.
		if (mPullRefreshing && height > mHeaderViewHeight) {
			finalHeight = mHeaderViewHeight;
		}
		mScrollBack = SCROLLBACK_HEADER;
		mScroller.startScroll(0, height, 0, finalHeight - height,
				SCROLL_DURATION);
		// trigger computeScroll
		invalidate();
	}

	private void updateFooterHeight(float delta) {
		if(!mHasMoreData){
			return;
		}
		int height = mFooterView.getBottomMargin() + (int) delta;
		if (mEnablePullLoad && !mPullLoading) {
			if (height > PULL_LOAD_MORE_DELTA) { // height enough to invoke load
													// more.
				mFooterView.setState(XListViewFooter.STATE_READY);
			} else {
				mFooterView.setState(XListViewFooter.STATE_NORMAL);
			}
		}
		mFooterView.setBottomMargin(height);

		// setSelection(mTotalItemCount - 1); // scroll to bottom
	}

	private void resetFooterHeight() {
		int bottomMargin = mFooterView.getBottomMargin();
		if (bottomMargin > 0) {
			mScrollBack = SCROLLBACK_FOOTER;
			mScroller.startScroll(0, bottomMargin, 0, -bottomMargin,
					SCROLL_DURATION);
			invalidate();
		}
	}

	private void startLoadMore() {
		mFooterView.show();
		if (!mHasMoreData) {
			Log.e("YM", "startLoadMore()");
			mPullLoading = false;
			mFooterView.setState(XListViewFooter.STATE_FINISH);
		} else {
			mPullLoading = true;
			mFooterView.setState(XListViewFooter.STATE_LOADING);
			if (mListViewListener != null) {
				mListViewListener.onLoadMore();
			}
		}
	}

	@Override
	public boolean onTouchEvent(MotionEvent ev) {
		if (mLastY == -1) {
			mLastY = ev.getRawY();
		}

		if (ev.getRawY() - mLastY > 5) {

			// NiceLogUtil.D("mLastY--->向上走着");
			if (horizentalHandler != null) {
				horizentalHandler.OnUpScroll();
			}
		} else if (ev.getRawY() - mLastY < -5) {
			// NiceLogUtil.D("mLastY--->向下走着");
			if (horizentalHandler != null) {
				horizentalHandler.OnDownScroll();
			}
		}
		switch (ev.getAction()) {
		case MotionEvent.ACTION_DOWN:
			mLastY = ev.getRawY();
			break;
		case MotionEvent.ACTION_MOVE:
			final float deltaY = ev.getRawY() - mLastY;
			mLastY = ev.getRawY();
			if (getFirstVisiblePosition() == 0
					&& (mHeaderView.getVisiableHeight() > 0 || deltaY > 0)) {
				// the first item is showing, header has shown or pull down.
				updateHeaderHeight(deltaY / OFFSET_RADIO);
				invokeOnScrolling();
			} else if (getLastVisiblePosition() == mTotalItemCount - 1
					&& (mFooterView.getBottomMargin() > 0 || deltaY < 0)) {
				// last item, already pulled up or want to pull up.
				updateFooterHeight(-deltaY / OFFSET_RADIO);
			}
			break;
		default:
			mLastY = -1; // reset
			if (getFirstVisiblePosition() == 0) {
				// invoke refresh
				if (mEnablePullRefresh
						&& mHeaderView.getVisiableHeight() > mHeaderViewHeight) {
					mPullRefreshing = true;
					mHeaderView.setState(XListViewHeader.STATE_REFRESHING);
					if (mListViewListener != null) {
						mListViewListener.onRefresh();
					}
				}
				resetHeaderHeight();
			} else if (getLastVisiblePosition() == mTotalItemCount - 1) {
				// invoke load more.
				if (mEnablePullLoad
						&& mFooterView.getBottomMargin() > PULL_LOAD_MORE_DELTA
						&& !mPullLoading) {
					startLoadMore();
				}
				resetFooterHeight();
			}
			if(getLastVisiblePosition() >= (mTotalItemCount - 1) / 2
					&& mEnablePullLoad && !mPullLoading){
				startLoadMore();
			}
			break;
		}

		// mGD.onTouchEvent(ev);
		return super.onTouchEvent(ev);
	}

/*	*//**
	 * @createtime 2015年12月2日 14:25:32
	 * @description 执行手动的刷新功能
	 * @author sufun
	 *//*
	public void SFOnRefreshListView()
	{
		mPullRefreshing=true;
		ViewGroup.LayoutParams params=new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT);
		mHeaderView.setBackgroundResource(R.color.app_bg);
		params.height=300;
		mHeaderView.setLayoutParams(params);

		mHeaderView.setVisibility(View.VISIBLE);
		mHeaderViewContent.setVisibility(View.VISIBLE);
		mHeaderViewContent.setLayoutParams(params);

		mHeaderView.setVisiableHeight(300);
		mHeaderView.setState(XListViewHeader.STATE_REFRESHING);
	}*/

	@Override
	public void computeScroll() {
		if (mScroller.computeScrollOffset()) {
			if (mScrollBack == SCROLLBACK_HEADER) {
				mHeaderView.setVisiableHeight(mScroller.getCurrY());
			} else {
				mFooterView.setBottomMargin(mScroller.getCurrY());
			}
			postInvalidate();
			invokeOnScrolling();
		}
		super.computeScroll();
	}

	@Override
	public void setOnScrollListener(OnScrollListener l) {
		mScrollListener = l;
	}

	@Override
	public void onScrollStateChanged(AbsListView view, int scrollState) {
		if (mScrollListener != null) {
			mScrollListener.onScrollStateChanged(view, scrollState);
		}
	}

	@Override
	public void onScroll(AbsListView view, int firstVisibleItem,
			int visibleItemCount, int totalItemCount) {
		// send to user's listener
		mTotalItemCount = totalItemCount;
		if (mScrollListener != null) {
			mScrollListener.onScroll(view, firstVisibleItem, visibleItemCount,
					totalItemCount);
		}
	}

	public void setXListViewListener(IXListViewListener l) {
		mListViewListener = l;
	}

	/**
	 * you can listen ListView.OnScrollListener or this one. it will invoke
	 * onXScrolling when header/footer scroll back.
	 */
	public interface OnXScrollListener extends OnScrollListener {
		void onXScrolling(View view);
	}

	/**
	 * implements this interface to get refresh/load more event.
	 */
	public interface IXListViewListener {
		void onRefresh();

		void onLoadMore();
	}

	
	//关于控件的本身如果进行缩放时的效果
	
	float mScale;

	public void setScale(float scale, boolean updateView) {
		mScale = scale;
		if (updateView) {
			ViewGroup.LayoutParams params = getLayoutParams();
			onUpdateScale(scale, params);
			setLayoutParams(params);
		}
	}

	public void onUpdateScale(float scale, ViewGroup.LayoutParams params) {
		this.layout( (int) (this.getX() * scale),(int) (this.getY() * scale), (int) (this.getX() * scale)+(int) (this.getWidth() * scale), (int) (this.getY() * scale)+(int) (this.getHeight() * scale));
	}
}
